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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    class A {
      constructor(name){
        this.name = name;
      }
      sayHello(age){
        this.age = age
      }
    }

   

  </script>
</body>
</html>